Apply suggestions from code review

Co-authored-by: Bernardo Belchior <[email protected]>
Signed-off-by: Alexandre Fauquette <[email protected]>

Author: alexfauquette

packages/x-charts/src/internals/commonNextFocusItem.ts

@@ -123,7 +123,6 @@ export function createGetPreviousSeriesFocusedItem<
 >(compatibleSeriesTypes: Set<OutSeriesType>) {
   return function getPreviousSeriesFocusedItem(
     currentItem: SeriesItemIdentifier<InSeriesType> | null,
-
     state: ChartState<[UseChartKeyboardNavigationSignature], []>,
   ): ReturnedItem<OutSeriesType> {
     const processedSeries = selectorChartSeriesProcessed(state);

packages/x-charts/src/internals/seriesHasData.ts

@@ -12,5 +12,5 @@ export function seriesHasData(
     return false;
   }
   const data = series[type]?.series[seriesId]?.data;
-  return data && data.length > 0;
+  return data != null && data.length > 0;
 }